PyHDX version 0.3.1

Major changes:

• Estimate errors in ΔG fit from covariances obtained from the Hessian
• Allow fitting of multiple 'states' (conditions) in batch
• Allow fitting of 2 aligned (homologous) protein conditions in batch
• Added console entry script such that the pyhdx server can be started with pyhdx serve (#191)

Minor changes:

• Input/output data table formats are now in comma separated values (.csv) format
• Updated support for reloading and fitting data in batch from .yaml files
• Updated rgb_to_hex function to work on arrays (vectorized)
• Added a colorbar to plotting of peptides (in plot.py)
• Refactored k_series to series in KineticsFitting objects
• Refactored cov to coverage in KineticsSeries objects
• Updates to docstrings
• Protein full sequences can optionally be added to Protein objects
• Moved fitting loop to separate function outside of main fitting object
• Protein objects now more closely mimic pandas' dataframes

Web application updates:

• 'Scores' (RFU) can be obtained as a table from the GUI
• User feedback on relative contribution of regularizer to fit result
• Control sidebar is now formatted as accordions where only one can be opened at a time
• Panel requirement bumped to >= 0.11, fixing scrolling issues in sidebar
• Added config file, currently lists default Dask cluster address to use

• Various bug fixes!

Thanks to @sajetan for contributing (#191, #181)